We have always used premium unleaded petrol in our 2008 Nissan Maxima, but for the past nine months it has pinged badly when the car is under load. I went to Nissan about it, but they told me the computer showed no problems. It has variously been suggested that I replace the knock sensor, change to cold plugs, and retard it by two degrees. I am concerned that it could cause damage in the long term and I would just like to get it fixed. Have you had any experience with this problem?
If the knock sensor was at fault it would show up as such on a computer check, and changing the plugs to colder ones is unlikely to do anything, and it's not possible to reset the ignition. Check the airflow meter and have a carbon clean carried out. The most likely cause of the problem is a build-up of carbon in the engine.
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